Sound amplifier



March 30 1926.

G. w. BULLEY SOUND AMPLIFIER Filed July 2,

W. T n e m I aew e WBw'zze 4144 AZ-Zys.

Patented Mar. 30, 1926.

UNITED STATES PATENT OFFICE.

GEORGE W. BULLEiyOF AKRON, OHIO ASSIG NDR TO THE MILLER RUBBER COMPANY,

. OF AKRON, OHIO, 'A CORPORATION OF OHIO.

scum) Amrm'rmrt.

Application filed July 2,

To all whom it may concern:

Be it known that I,-GE0RGE W. BULLEY. a citizen of the United States, and resident of Akron, in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Sound Amplifiers, of which the following is a specification.

My present invention relates to im rovements in horns or amplifiers for "ra '0 receiving sets, and aims to provide an article of sufiicient size to give substantial sound amplification while at the same time ena'bling it 'to beplaced ina relatively small' cabinet.

The invention consists in turning the neck of the horn back u on itself and causing it to enter the wall 0 the bell portion so that it is adapted to carry the loudspeaker inside the bell.

The invention further includes the novel construction by which such horn may be readily manufactured. 7 An embodiment of the invention is illustrated in the accompanying drawing, in which i I Figure 1 is a side elevation of an amplifying horn partly broken away.

Fig. 2 is a face'view.

Fig. 3 is a View with the parts of the horn as they appear before assembly, partly broken away.

Fig. 4 is a sectional detail on line 4-4 of Fi 1. Y

heferring by reference characters to this drawing, the numeral 1 desi ates the bell portion, of the horn, and 2 t e neck. The

ell portion is provided with an openingl' in one side thereof, and the neck portion is doubled back and'provided-with an angularly turned end 2' which passes through the; opening and is adapted to carry on its end within the bell, the ordinary loud speaker unit, conventionally indicated at 3.

The most convenient method of manufacture is to mold the bell and neck portions separately, of suitable material such as hard rubber, the line of junction, Fig. 1, being indicated by the transverse line 1", and the parts being adapted to be subsequently 1925. Serial No. 41,197.

connected, the end 2 being slipped through the opening 1 in the bringing of the parts together.

\The portion 2 is made slightly tapered I and designed to fit the opening with a tight or wedging fit, which will exclude air passage at the joint. I have found that the parts may be readily connected at the line of juncture by providing them with interengaging beads and grooves, as for example by forming the neck portion at its larger end with an annular bead 2 and the portion 1 of the bell with an internal annular groove 1.

On warming (and thus softening) the interengaging edges b suitable means, such as a water bath, the ead may be snapped into the recess and after cooling a tight and '1. A horn or sound amplifier for radio receiving sets, having the neck thereof projected through one wall of the bell portion and terminating inthe bell portion, and adapted to carry the loud speaker unit.

2. A horn according to claim 1, in which the bell and neck (portions comprise separate portions provide with means, for connectmg them together.

3. A horn or sound amplifier comprising a bell portion and a neck portion, one of said parts having an annular groove and. the,

other an annular bead engaging the groove, said bell portion having an openin in its wall, and said neck portion being oubled back upon itself and provid d with an angular turned end projecting through said openmg.

I In testimony whereof, I afiix my signature. Y

GEORGE W. .BU'LLEY. 

